Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gregory Declark, D.C.
Chiropractor in Elmhurst, IL · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1699288837
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Registry record
Entity type Individual (Type 1)
Name Gregory Declark
Credential D.C.
Sex Male
Practice address 477 S Spring Rd, Elmhurst, IL, 60126
Phone (630) 530-0506
Enumeration date Nov 9, 2017
Last updated in NPPES Jul 1, 2019
Taxonomy & licenses
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders.
About the DC credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Where does Gregory Declark practice?
The practice location on file with NPPES is in Elmhurst, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Gregory Declark?
The National Provider Identifier (NPI) for Gregory Declark is 1699288837, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-07-01.